Suport hash for tool parameters

Using a hash skips a handful of verification steps.

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    omniai (1.8.0)
+    omniai (1.8.1)
       event_stream_parser
       http
       zeitwerk

lib/omniai/tool.rb

@@ -53,7 +53,10 @@ def initialize(function, name:, description: nil, parameters: nil)
     #   #     parameters: {
     #   #       type: 'object',
     #   #       properties: {
-    #   #         n: OmniAI::Tool::Property.integer(description: 'The nth Fibonacci number to calculate')
+    #   #         n: {
+    #   #           description: 'The nth Fibonacci number to calculate')
+    #   #           type: 'integer'
+    #   #         }
     #   #       },
     #   #       required: ['n']
     #   #     }
@@ -71,7 +74,7 @@ def serialize(context: nil)
         function: {
           name: @name,
           description: @description,
-          parameters: @parameters&.prepare,
+          parameters: @parameters.is_a?(Tool::Parameters) ? @parameters.serialize : @parameters,
         }.compact,
       }
     end
@@ -83,7 +86,7 @@ def serialize(context: nil)
     # @param args [Hash]
     # @return [String]
     def call(args = {})
-      @function.call(**(@parameters ? @parameters.parse(args) : args))
+      @function.call(**(@parameters.is_a?(Tool::Parameters) ? @parameters.parse(args) : args))
     end
   end
 end

lib/omniai/tool/parameters.rb

@@ -24,10 +24,10 @@ def initialize(type: Type::OBJECT, properties: {}, required: [])
       end
 
       # @return [Hash]
-      def prepare
+      def serialize
         {
           type: @type,
-          properties: @properties.transform_values(&:prepare),
+          properties: @properties.transform_values(&:serialize),
           required: @required,
         }.compact
       end

lib/omniai/tool/property.rb

@@ -60,15 +60,15 @@ def initialize(type:, description: nil, enum: nil)
       end
 
       # @example
-      #   property.prepare
+      #   property.serialize
       #   # {
       #   #   type: 'string',
       #   #   description: 'The unit (e.g. "fahrenheit" or "celsius").'
       #   #   enum: %w[fahrenheit celsius]
       #   # }
       #
       # @return [Hash]
-      def prepare
+      def serialize
         {
           type: @type,
           description: @description,

lib/omniai/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OmniAI
-  VERSION = '1.8.0'
+  VERSION = '1.8.1'
 end

spec/omniai/tool/parameters_spec.rb

@@ -11,9 +11,9 @@
 
   let(:required) { %i[n] }
 
-  describe '#prepare' do
+  describe '#serialize' do
     it 'converts the parameters to a hash' do
-      expect(parameters.prepare).to eq({
+      expect(parameters.serialize).to eq({
         type: 'object',
         properties: {
           n: { type: 'integer', description: 'The nth number to calculate.' },

spec/omniai/tool/property_spec.rb

@@ -31,9 +31,9 @@
     it { expect(property.type).to eq('number') }
   end
 
-  describe '#prepare' do
+  describe '#serialize' do
     it 'converts the property to a hash' do
-      expect(property.prepare).to eq({
+      expect(property.serialize).to eq({
         type: 'string',
         description: 'The unit (e.g. "fahrenheit" or "celsius")',
         enum: %w[fahrenheit celsius],